Exhaust-gas turbocharger for an internal combustion engine

Abstract

In an exhaust gas turbocharger for an internal combustion engine having air intake ducts and exhaust gas discharge ducts including a compressor and a turbine with at least two inlet flow passages, a flow adjusting device (15) arranged in the exhaust gas discharge ducts upstream of the turbine and including a rotary slide valve for controlling the exhaust gas flow first and second flow channels extending through the rotary slide, a third flow channel extends axially partially through the rotary slide valve via inlet openings at the circumference of the rotary slide which can be brought into overlapping relationship with rotary slide housing openings for controlling the exhaust gas flow from the engine to the turbine.

Description

[0001]This is a Continuation-In-Part Application of pending International Patent Application PCT / EP2005 / 011928 filed Nov. 8, 2005 and claiming the priority of German patent application 10 2004 055 571.0 filed Nov. 18, 2004.BACKGROUND OF THE INVENTION[0002]The invention relates to an exhaust-gas turbocharger for an internal combustion engine including a compressor disposed in an engine intake section and or turbine disposed in an engine exhaust section and having a plurality of exhaust gas inlet flows and a turbine bypass line and a rotary slide valve for controlling the exhaust gas flows through and past the turbine.[0003]DE 196 18 160 C2 discloses an exhaust-gas turbocharger for an internal combustion engine, the turbine of which has a rotor and a turbine housing having at least two inlet flow passages which are separated by a separating wall, and a bypass branching off from at least one flow passage. Exhaust gas can be conducted away from at least one flow passage via this bypass....

AI Technical Summary

Benefits of technology

The invention is a flow adjusting device for an exhaust gas turbocharger in a supercharged internal combustion engine. The device includes a rotary slide valve with multiple flow channels that allow exhaust gas to flow into the turbine wheel while swirl and flow speed are increased during engine braking mode. The arrangement of the channels reduces flow loss and allows for a compact overall design. The device also allows for a flow diversion of exhaust gas from one flow passage to another, and ensures that flow loss correction values of the flow in the flow channels are virtually identical. The technical effects of the invention include improved engine performance and efficiency.

Problems solved by technology

The turbo-brake radial flow guide structures are filigree precision casting die parts which are more expensive the higher the mechanical and thermal requirements are on account of high exhaust gas mass flows.

Images